Ars Nova translates to "New Art" and it represented the replacement of Ars Antiqua (Old Art). The innovation that came along with the Ars Nova Treatise was the concept of time and prolation within music. A system was developed to define how long each note was and how it would be counted in music. Some of the different terms associated with this were Breve, Semibreve, and Minim. It separated perfect and imperfect time, as well as major and minor prolation.